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Actually they did explain kinimaro's past they just didnt go all super emo with i, basically oro stated he was the last of a a war like tribe that basically killed itself by going crazy in a war. talked, about his power etc. Much of what happened in the anime was added. it was basically just oro describing what happened (no prison scene or flower and all that)

Anyhow naruto doesnt need to throw this jutsu for it to be deadly, still he needs to connect with it.
That needing to connect means that even if the sharingan cant see whats going on when it hits, they ll still be able to see naruto's tricks to make it land. As far as being able to throw it, i dont really see the point, its just as easy to dodge if not easier to dodge.

how he landed the blow does seem ehhh, but mostly he messed up, he should have stayed long range. For kazuku i think we got most the backstory we need, hidan is a different story. oh well lets see how it all pans out

-Aww, look at how happy he is. Such a deceiving smile Syaoran. We all know that behind that deceptive smile and laughter lies a monster ready to showcase his power to the world (and in case you are wondering, I am not referring to the Kyuubi at all). Oh, wait I forgot, he already proved his power, time and time again...

Rasengan's gotta be more than half complete overall. I mean it's already strong enough to kill without wind chakra, then he adds the super destructive aspect. Pluss he's prolly adding more than a normal amount cuz of his insane chakra level. In terms of power I would be surprised if there's still a body left.
EX/ Water tower, Kabuto(w/regen), vs. Rasengan (which can peirce mountains)

This new rasengan should just anihilate. On a molecular level. If you think about how rasengan works it just muliplies the destructive power by using the physics of explosion. It did that much when it could fit in the palm of your hand, so imagine what it can do when it's bigger than your body. The results should be exponetial.

what is everyone's fascination about Naruto's completed new jutsu becoming a long range attack about? Not that it's a bad idea but I really don't see the point in Naruto having a long range move.

The main reason is: diversification. Up 'til now, Naruto has used the same tricks over and over. And he already has the plain rasengan/oodama + thousand punch/kicks for close combat + 1000 years of pain . Hopefully, at 100% it can actually be thrown and directed (even if it's not the most original concept).

Spoiler:

Without having read the new chapter, I'm sort of disappointed that Kishimoto didn't re-build the tension prior the final release of this jutsu. And even more with Kakuzu. His character was portrayed as someone clever, perhaps as a counter for Hidan's hot-headness. But it ended up being a relatively weak and static fighter (he had 2 other masks, could have devised some strategy/distraction).

Not even a classic "final jutsu" for him? heh.

The good thing is Naruto is now back in track, and has a technique that put him as a more serious contender in the series.

The question now is, what's next? No one in Konoha has any leads to follow and continue the story. Neither to find the Akatsuki cave, nor Oro's Lair. So either the pair is not done yet and will spill some information, or Zetsu is going to make a grand entrance in order for Naruto et al, to somehow purse him (hopefully, with the aid of team Kurenai) or get some news about the other jinchuuriki. Otherwise, they will have to wait until one of their enemies make the first step or Jiraya finally returns.